An object travels North at $8 m/s$ for $4 s$ and then travels South at $5 m/s$ for $7 s$ . What are the object's average speed and velocity?

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Answer 1 · 2017-07-28T19:42:20

The average speed is $=6.09ms^-1$
The average velocity is $=0.27ms^-1$

The total distance travelled is $d=8*4+5*7=32+35=67m$

The total time is $t=7+4=11s$

The average speed is

$barv=d/t=67/11=6.09ms^-1$

The displacement is

$Deltax=8*4-5*7=32-35=-3m$

The average velocity is

$=(Deltax)/t=3/11=0.27ms^-1$

An object travels North at 8 m/s8 m/s for 4 s4 s and then travels South at 5 m/s5 m/s for 7 s7 s. What are the object's average speed and velocity?